Mattress foundation



FIG. 1 is a perspective view of the mattress foundation.

FIG. 2 is a top view of the mattress foundation of FIG. 1.

FIG. 3 is a bottom view of the mattress foundation of FIG. 1.

FIG. 4 is a side view of the mattress foundation of FIG. 1, identical to the opposite side view thereof; and,

FIG. 5 is an end view of the mattress foundation of FIG. 1, identical to the opposite end view thereof. 

The ornamental designs for the mattress foundation, as shown and described. 